Melt remaining 2 Tbsp butter. Place one sheet of fillo on work surface at a time. Brush lightly with some melted butter. Using a pizza cutter, cut crosswise into strips (about 1/2 in. each). Place strips randomly on top of chicken mixture. Continue with remaining fillo and butter. Bake 20 to 25 minutes until filling is hot and fillo is browned. Sprinkle casserole with additional confectioners' sugar, if desired.

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